[debian] fix init script dependencies (closes #1921729)
Facility names starting with $ are reserved system facilities. Other
scripts can be referred to using the facility name listed in Provides
directly.
Document: cubicweb-doc
Title: CubicWeb documentation
Author: Logilab
Abstract: Some base documentation for CubicWeb users and developpers
Section: Apps/Programming
Format: HTML
Index: /usr/share/doc/cubicweb-documentation/index.html
Files: /usr/share/doc/cubicweb-documentation/*.html